Lucian was a Greek satirist who spoke sarcastically of Christ and Christians, but in the process, he did affirm they were real people and never referred to them as fictional characters:

"The Christians, you know, worship a man to this day"the distinguished personage who introduced their novel rites, and was crucified on that account".You see, these misguided creatures start with the general conviction that they are immortal for all time, which explains the contempt of death and voluntary self-devotion which are so common among them; and then it was impressed on them by their original lawgiver that they are all brothers, from the moment that they are converted, and deny the gods of Greece, and worship the crucified sage, and live after his laws. All this they take quite on faith, with the result that they despise all worldly goods alike, regarding them merely as common property." (Lucian, The Death of Peregrine. 11-13)

From this account we can add to our description of Jesus: He taught about repentance and about the family of God. These teachings were quickly adopted by Jesus" followers and exhibited to the world around them.